PB1973: INHIBITION OF LACTATE EXPORTERS INDUCES DIRECT ANTI-TUMOR EFFECTS AND COUNTERS IMMUNE SUPPRESSION IN MULTIPLE MYELOMA. (23rd June 2022) - Van der Vreken, A.; Oudaert, I.; Maes, A.; De Bruyne, E.; De Veirman, K.; Vanderkerken, K.; Menu, E.